Conexant Systems, Inc.

Skyworks Solutions, Inc.

David O Anderton

Yongbing Wan

John S Walley

Steven A Gronemeyer

Kenneth David Ko

Jamal Haque

P Michael Henderson

Joel D Peshkin

Raphael Rahamim

Edward S Zuranski

Ganning Yang

Kenneth Scott Walley

Shrenik P Patravali

Anthony A Tzouris

Frederic M Stubbe

Ismail I Eldumiati

Don L Harmer

Jaleh Komaili

Earl Clyde Cox

Jeffrey D Klein

Karim Younes

Scott Walley

Earl C Cox

A digital subscriber line (DSL) communication system that utilizes the high frequency band of a standard telephone line does not require the use of a plain old telephone service (POTS) splitter in the resident's home, which provided isolation between the POTS frequency band (0 to 4 kHz) and the DSL frequency band. A digital subscriber line modem utilizes either constant envelope modulation or quadrature amplitude modulation for outputting DSL signals upstream to a central office. When a telephone in the resident's home is detected as being off-hook, then the constant envelope modulation is used by the DSL modem in order to lessen the intermodulation product distortion that results in audible noise heard by a user of the telephone. When the telephone is on-hook, then another type of modulation, such as QAM, is used to maximize the upstream data rate capability in the DSL frequency band, since any noise generated by the QAM is not a problem due to the non-use of the POTS frequency band.

Modulation switching for DSL signal transmission

A power management system for a mobile unit wherein the mobile unit detects the quality of the signals received from the base station. Based on this signal quality, the mobile unit determines if the voice data could be adequately transmitted using a secondary speech coder. If the transmission quality is adequate, the mobile unit switches from a primary speech coder to a secondary speech coder. The secondary speech coder is compatible with the primary speech coder, but consumes significantly less battery power when coding and decoding the voice data. The mobile unit may alternatively monitor the amount of processor usage. If the processor usage exceeds a threshold level, the mobile unit switches from the primary speech coder to the secondary speech coder.

Method and apparatus for dynamically switching between speech coders of a mobile unit as a function of received signal quality

The present invention provides methods and apparatus for controlling power utilization in a wireless communication receiver. A representative system comprises a signal properties evaluation module, an analog to digital converter (ADC), and an analog to digital converter control module. The signal properties evaluation module evaluates the stability of a received signal, and provides an indication of the stability. The ADC control module responds to the signal properties evaluation module to select the precision of the ADC based upon the indication of the stability. The ADC has at least two modes of operation, comprising a first precision and a second precision, and is responsive to the signal properties evaluation module to operate in at least one of two modes based upon the stability. The ADC responds to the signal properties evaluation module so as to limit the amount of power consumed by the wireless communications device.

Adaptive wireless communication receiver

An echo canceller has an adaptive filter with an input coupled to a digitized audio input producing samples at a first rate. The adaptive filter also produces an estimated digitized audio feedback signal at the first rate based upon a set of tap values. A controller is coupled to the adaptive filter and determines the values of the set of tap values. A shared processor is coupled to the adaptive filter and the controller. The shared processor services tasks of the adaptive filter and the controller as well as other devices. When the adaptive filter has converged upon an unknown echo channel response, the controller determines the set of tap values at a rate lower than the first rate.

Method of and apparatus for adaptation of an echo canceller in a system with multitasking

A power management system for a mobile unit wherein the frequency of detecting a paging message may be controlled. The quality of the signal transmitted by a base station and the acceptable delay are determined by the mobile unit. The mobile unit compares these factors to the current paging message monitoring rate. If a further delay is acceptable, the present invention inhibits monitoring of at least one cycle of the paging message. Each cycle of the paging message inhibited conserves battery power in the mobile unit. The mobile unit also includes a technique for the user to disable the power savings feature.

Power management system for a mobile unit by intelligent page monitoring

A digital subscriber line (DSL) communication system that utilizes the high frequency band of a standard telephone line does not require the use of a plain old telephone service (POTS) splitter in the resident's home, which provided isolation between the POTS frequency band (0 to 4 kHz) and the DSL frequency band. Digital signal processing techniques are utilized to adapt to varying subscriber line conditions due to POTS telephone equipment. The digital signal processing techniques eliminate the need for a splitter by reducing susceptibility to distortion due to varying subscriber line characteristics. The digital subscriber line modem utilizes constant envelope modulated signals and frequency division multiplexing, where the constant envelope modulations lessens the intermodulation distortion products due to DSL signals that are transmitted by the modem and which may result in audible noise at the POTS telephone equipment due to non-linearities of the POTS telephone equipment.

Constant envelope modulation for splitterless DSL transmission

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Rancho Santa Margarita, CA, United States of America

David O Anderton